Finding the Fourth Proportional to 21,146.15, 31,716.48 and 7,996.81

Step by Step Solution

1. Step 1: Write the proportion equation
   21,146.15 : 31,716.48 = 7,996.81 : x
2. Step 2: Convert to fraction form
   21,146.15/31,716.48 = 7,996.81/x
3. Step 3: Cross multiply
   21,146.15x = 31,716.48 × 7,996.81
4. Step 4: Simplify right side
   21,146.15x = 253,630,664.43
5. Step 5: Solve for x
   x = 253,630,664.43/21,146.15
6. Step 6: Final answer
   x = 11,994.18